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For all of you who are interested in Faction vendors, this post is for you. Hope this helps.

Vendor- Guillermel
Location- Caravan
Badges needed- Ghultures bane, Trengil Thrasher, Conscript crusher, Archaeologist, Treasure hunter

Vendor- Captain Kettay
Location- Caterwaul Canyons
Badges needed-Tabbi Soldier, Caterwaul Conscript,Tabbi General, Wurmslayer,

Vendor- Advisor Francy Fries
Location- Rubal Wastes, house Calixco
Badges needed- Boa bruiser, Calixco commando, Unconstrictable, Vipers' Bane

Vendor- Perfect Josapat
Location- Yakhal Mountain, House Sayameez
Badges needed- Sayameez sergeant, Dunes marshal, Rebellion Crusher, Sandwitches' Scourge

Vendor- Destro-Uctor
Location- Istanboa
Badges needed- Serpentine scout, Dunes warrior, Serpentine avenger

What all these vendors sell is: A set of clothing [Hat, Robe, Boots] , Banner [Wand], Mount, House, Banner [Housing item], Tapestry to where the vendors are & housing idols. I hope I didn't miss any faction vendors out. If I did please let me know.

https://www.wizard101.com/forum/mirage/26-known-mirage-badges-8ad6a42b58e2e1750159191ed5d76649/8ad6a4245920a621015944ea43ed2c5c?fromSearchResult=true#8ad6a4245920a621015944ea43ed2c5c

The link above will help you lot for what you need to defeat or do to earn the badges. Thank you TylerWildPants for posting the 26 badges of Mirage as it is very useful.